/*
 * This file is part of Adblock Plus <https://adblockplus.org/>,
 * Copyright (C) 2006-2017 eyeo GmbH
 *
 * Adblock Plus is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 3 as
 * published by the Free Software Foundation.
 *
 * Adblock Plus is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 */

/* globals Components */

"use strict";

function E(id)
{
  return document.getElementById(id);
}

function getDocLink(link, callback)
{
  ext.backgroundPage.sendMessage({
    type: "app.get",
    what: "doclink",
    link
  }, callback);
}

function checkShareResource(url, callback)
{
  ext.backgroundPage.sendMessage({
    type: "filters.blocked",
    url,
    requestType: "SCRIPT",
    docDomain: "adblockplus.org",
    thirdParty: true
  }, callback);
}

function openSharePopup(url)
{
  let glassPane = E("glass-pane");
  if (!glassPane)
  {
    glassPane = document.createElement("div");
    glassPane.setAttribute("id", "glass-pane");
    document.body.appendChild(glassPane);
  }

  let iframe = E("share-popup");
  if (!iframe)
  {
    iframe = document.createElement("iframe");
    iframe.setAttribute("id", "share-popup");
    iframe.setAttribute("scrolling", "no");
    glassPane.appendChild(iframe);
  }

  // Firefox 38+ no longer allows messaging using postMessage so we need
  // to have a fake top level frame to avoid problems with scripts that try to
  // communicate with the first-run page
  let isGecko = ("Components" in window);
  if (isGecko)
  {
    try
    {
      let Ci = Components.interfaces;
      let docShell = iframe.contentWindow
        .QueryInterface(Ci.nsIInterfaceRequestor)
        .getInterface(Ci.nsIDocShell);

      if (typeof docShell.frameType != "undefined")
      {
        // Gecko 47+
        docShell.frameType = docShell.FRAME_TYPE_BROWSER;
      }
      else
      {
        // Legacy branch
        docShell.setIsBrowserInsideApp(
          Ci.nsIScriptSecurityManager.UNKNOWN_APP_ID
        );
      }
    }
    catch (ex)
    {
      console.error(ex);
    }
  }

  let popupMessageReceived = false;
  function resizePopup(width, height)
  {
    iframe.width = width;
    iframe.height = height;
    iframe.style.marginTop = -height / 2 + "px";
    iframe.style.marginLeft = -width / 2 + "px";
    popupMessageReceived = true;
    window.removeEventListener("message", popupMessageListener);
  }

  let popupMessageListener = function(event)
  {
    if (!/[./]adblockplus\.org$/.test(event.origin) ||
        !("width" in event.data) || !("height" in event.data))
      return;

    resizePopup(event.data.width, event.data.height);
  };
  // Firefox requires last parameter to be true to be triggered by
  // unprivileged pages
  window.addEventListener("message", popupMessageListener, false, true);

  let popupLoadListener = function()
  {
    if (!popupMessageReceived && isGecko)
    {
      let rootElement = iframe.contentDocument.documentElement;
      let {width, height} = rootElement.dataset;
      if (width && height)
        resizePopup(width, height);
    }

    if (popupMessageReceived)
    {
      iframe.className = "visible";

      let popupCloseListener = function()
      {
        iframe.className = glassPane.className = "";
        document.removeEventListener("click", popupCloseListener);
      };
      document.addEventListener("click", popupCloseListener, false);
    }
    else
    {
      glassPane.className = "";
      window.removeEventListener("message", popupMessageListener);
    }

    iframe.removeEventListener("load", popupLoadListener);
  };
  iframe.addEventListener("load", popupLoadListener, false);

  iframe.src = url;
  glassPane.className = "visible";
}